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L-citrulline plays an important role in human health and nutrition and is an intermediate of the L-arginine biosynthetic pathway. L-citrulline is a by-product of L-arginine production by  Corynebacterium glutamicum . In this study,  C. glutamicum  was engineered for overproduction of L-citrulline as major product without L-arginine being produced as by-product. To this end, L-arginine biosynthesis was derepressed by deletion of the arginine repressor gene  argR  and conversion of L-citrulline towards L-arginine was avoided by deletion of the argininosuccinate synthetase gene  argG . Moreover, to facilitate L-citrulline production the gene encoding a feedback resistant N-acetyl L-glutamate kinase  argB  fbr  as well as the gene encoding L-ornithine carbamoylphosphate transferase  argF  were overexpressed. The resulting strain accumulated 44.1 ± 0.5 mM L-citrulline from glucose minimal medium with a yield of 0.38 ± 0.01 g⋅g −1  and a volumetric productivity of 0.32 ± 0.01 g⋅l −1 ⋅h −1 . In addition, production of L-citrulline from the alternative carbon sources starch, xylose, and glucosamine could be demonstrated.   Electronic supplementary material  The online version of this article (doi:10.1186/s13568-014-0085-0) contains supplementary material, which is available to authorized users.

L-citrulline production by metabolically engineered Corynebacterium glutamicum from glucose and alternative carbon sources